Radio receiving apparatus



Sept- 270, 1932- T. J. scoFlELD ETAL 1,878,190

RADIo RECEIVING APPARATUS Filed July 15. 192'? 2 Sheets-Sheet l El. Z 2

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RADIO RECEIVING APPARATUS Filed July 15, 1927 2 Sheets-Sheet. 2

lill/1111111111111. 1 /111//1//1' ...EI-' Nrs/Vrana Y BY TroR/vfys Patented Sept. 20, 1932 @UNITED STATES PATENT ori-*lcs THEODORE J'. SCOFIELD AND WILLIAM MINER, 4Olli` JACKSON, MICHIGAN, ASSIGNORS TO THE SPARKS-WITHINGTON COMPANY, F JACKSON, MICHIGAN, A CORPORATION 0F OHIO Ramo RECEIVING APPARATUS lApplication led July 15,

This invention relates to certain new and useful improvements inl radio receiving apparatus."

Certain types of radio receiving sets embody a plurality of variable condensers which are generally arranged in a row and which are operated in unison by means of a knob or other device, and it is to that particular type of appara-tusthat this invention per tains. A

The main object of the invention is the provision of a structure of marked rigidity and strength for supporting and connecting"r a plurality of variable condensers, and by means of which the desired central spacing of the condensers, i. e. the distance between the axes of `their` respective rotors, is rigidly and positively maintained. y Another object is to provide a means wherel by the operation ofthe condensers may be at all times positive and smooth. I

Other objects and advantages relate to the details of the structure and to the form and relation of the parts thereof, all as will more fully appear from the following description takenin connection 'with the accompanying drawings, in which:

Figure 1 is an elevation of a radio receiving cabinet.

Figure 2 is a section von line 2 2 of Figure 1.

-Figure 3 is a top view of the condenser assembly and driving mechanism, partially broken away.

Figure 4 is an elevation of one of the driving wheels. p Figure is a section on line 5-5 of Figy ure 3.

Figure 6 is a perspective View of the driv- 40 ing wire assembly.

Figure 7 is a section on line 7-7 of Figure 5.

Figure 8 is a section on line 8 8, Figure 2. Figure 9 is a front elevation of the indicat- *5 ing dial.

In the drawings like'numbers referto like parts. The invention here contemplates embodying -a plurality of variable condensers, and 5 in Figures 3 and 5 there are illustrated four 1927. Serial No. 205,938.

such condensers, but it will be understood that ythis disclosure is merely illustrative, and vthat any number of condensers may be mounted and connected together in the manner to be described.

As shown, four variable condensers |--1 are mounted in line upon a strip *2- which may or may not be of an insulating material depending upon the type of radio receiving set. These condensers are aflixed to the strip -2- in spaced relation by screws -3- or other convenient means, with their rotor shafts -4- and sleeves -llextending through strip -2- and carrying on the ends of said rotor shafts -4- driving wheels -5-. The condensers -1- are also secured' to sub-base -6- by screws -7- or other convenient means.`

The variable condensers here shown comprise a U-shape frame -.8- of sheet metal or the like, the legs -9- and -10- of this frame being formed With bearings at their lower ends for the reception of the rotor shaft 4%. The forward bearing,as shown, may be .formed of a headed sleeve l1- which extends thru an opening in the arm -10- and has a nut l2- mounted thereon for securing the sleeve in vthe arm, and the rotor shaft is j ournaled in the sleeve -11-. The condensers in the usual manner consist of a plurality of rotor plates l3- rigidly secured to the rotor 14.- and a plurality of stator plates -15- rigidly mounted on crossfbars I6- and 16asecured to the legs -9- and l0- the stator and rotor plates being alternately arranged. The rear legs -9- of cohdensers 1 carry on their rear facesI headed screws +44- ixed; in position by nuts 45. Spring wires 46- encircle screws 44- with their upper ends 117- extending through holes -48- in legs -9. and theirvlower ends '49- thrusting against V-slots -50--in rotor shafts -4-.

' A dial wheel 17,- carrying a hub 20- is rotatably mounted on shaft '18- having a shoulder 18a and which is secured to subbase -6- by screws`-19- or other convenient means. vDial wheel -17 is retained in position on shaft -18- by means of a coI- l lar -21- and screw 22- threaded into the end of shaft -18-. An indicating dial -23- is fitted over hub 20- and retained i in position by springwasher 2A- which is made in the form of a split ring fitting into a circumferential groove (not shown) in the end of hub -20. This mounting of indicating dial -23- permits adjusting indicating dial -23- in relation to hub -20- if such is desired.

A main driving wheel -25- is fastened to the front face of one of the driving wheels -5- and concentric therewith by means of screws -26'- or other convenient means. The specific construction of main driving wheel 2 and the take-up mechanism for driving cord -27- is not here described as it is disclosed in our co-pending application Serial No. 156,133.

An actuating knob -28 carrying a shaft -29- journaled in a bearing -30 is positioned in the front panel -31- of the cabinet B2- The rear end of the shaft -29- carries a drum -33- held in position by setscrew 234- and having a-circumferential groove 'for the reception of driving cord Driving wheels -5 are provided with parallel circumferential slots -35- joined by slot -36- positioned diagonally across the faces of driving wheels -5, the advantage of this construction being that the wire does not at any time have two strands in one slot which would cause binding and uneven tension.

Dial wheel l7 is provided with a counter-sunk depression -37- in its rear face in which are positioned takeup screws B8- and lock screws -39-, and carries on its outer surface parallel circumferential slots -40- from each of which a hole (not shown) ,leads in depression -37-- Set screws 4lare provided to impinge upon the Shanks of take-up screws -38 which arev provided withy holes (shown in dotted lines in Fig. 8) for the reception of the ends of drive wire A slot 43- in the front panel -31- permits the numbers on indicating dial H23- to be seen as the same is rotated.

In assemblyl one end of the drive wire -42- is passed through one of the holes connecting slots -40- with depression -37- and fastened in place by means of the take-up screw -38- and one locking screw 39, the holes pointing downward. The drive wire 42- is then passed upwardly in slot 4G- over the top of main drive wheel -17- and carried into a slot- 35eon the top of one of the drive wheels 5 which is at the end of the row of condensers -1-, the cross-slot -36- of the drive wheel 5- facing towards main drive wheel -l7-. The drive wire -42- is passed around the drive wheel -5- until it reaches cross-slot -36 into which it is led and then carried around drive-wheel -5- to the bottom thereof, and then taken to the next adjacent drive- `wheel 5 where this winding operation is repeated. Each drive wheel -5- is in turn encircled in a similar manner by drive-wire 42- until the drive wire -42- is led back into the second slot L10- on the top of main drive wheel -17 and around said wheel, and through t-he hole in the slot 40- into depression -37-, where it is fastened to one of the take-up screws 39. This take-up screw -39- is then adjusted until the tension of the drive wire 42- is correct throughout the circuit. lVhen this result is achieved locking nut 39- and set screws 4lare tightened. Also drive wire -42- is secured to each drive wheel -5- by means of washers -51 and screws -52 disposed in cross slots -36-.

Drive cord 27 is then placedaroun'd the rim of main drive wheel 25 and drum 33 on knob 28. The tension on the drive wire 42 insures that the front ends of the rotor shafts 4 will always be held in the same position in relation -to their bearings and to each other, and the spring wires 46 accomplish the same result for the rear ends of the rotor shafts -4, which, taken together with the extreme rigidity of the apparatus due to the use of strip -2-, gives a rigid, permanent and efficient structure, not only mechanically but in the maintenance of a pre-determined electrical capacity of various adjustments of the units of the apparatus, and altho we have shown and described a specific structure as constituting an embodiment of the invention, we do not desire to restrict ourselves to the exact form or relation of the parts thereof, as various changes and modifications may be made within the scope of the appended claims.

We claim:

1. A radio receiving apparatus comprising a plurality of condensers arranged in line, and each condenser including a base, and arms extending therefrom, a sub-base, means for securing the condenser base to the subbase, and a strip connected to the arms of the condensers to maintain them rigidly in curing the condenser base to the sub-base, a strip connected to the arms of the condensers to maintain them rigidly in pre-determined relation, and means for actuating said condensers in unison.

4. A radio receiving apparatus comprising a plurality of condensers arranged in line, each condenser including a base, arms extending therefrom, a sub-base, means for securing the condenser base to the sub-base, a strip connected to the arms of the condensers to maintain them rigidly in pre-determined relation, and means for retaining each condenser rotor shaft in fixed relation to its bearing and to the` other condenser rotor shafts.

5. A radio receiving apparatus comprising a plurality of condensers arranged in line, each condenser including a base, arms extending therefrom, a sub-base, means for securing the condenser base to the sub-base, a strip connected to the arms of the condensers to maintain them rigidly in pre-determined relation, spring means at one end thereof, and means for retaining each condenser rotor shaft in fixed relation to its bearing and to the other condenser rotor shats.

In Witness whereof we have hereunto set our hands this 30th day of June, 1927.

THEODORE J. SCOFIELD. WILLIAM MINER. 

